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Everything posted by Bob(AK)

  1. Bob, is the word you are looking for "geodized"
  2. Looks like Alaskan blizzard stone. If so a magnet will stick to it. It is a gabbro of feldspar crystals in a black serpentine material, my guess
  3. Does not look like serpentine to me, but as BMC said, serpentine is soft so check hardness. There are many green rocks
  4. I agree with Bedrock B, limestone with fossils. Try some vinegar or weak hydrochloric the limestone will fizz
  5. Usually carry .44 mag, certain places I carry a rifle
  6. What I call a nice piece of jasper
  7. first photo looks like agatized breccia
  8. How hard is this piece? Both chalcocite and covellite are quite soft and both will ring loudly on a detector. The top photo looks brown on the end is that so?
  9. agree with fuss, quartz, pegmatite looking
  10. Back to rock tumbling Bob. I am no expert, just the way I do this. As I said before I use nothing coarser then 220 grit silicon. Also use it on vibrating flat laps since coarser eats them up too fast. With tumbling I do use the 12 lb rotary tumbler for about a week with ceramic media to take up spaces. Then the sonic tumbler for 600 grit also with ceramic media (each step has its own ceramic) for about 4 days. Next the pre polish for 3-4 days and then the tin oxide polish with aluminum oxide pellets for 3-4 days. I have then added a burnishing step with borax for about 2 days using the same pellets as in the polish step. This last step removes any film that may be on the stones. That is what I now do but I am not telling anyone to do like this. PS. many of the vibrating tumblers are very loud. One made of rubber or rubber liner is much better. PSS> The Diamond Pacific Sonic tumblers are great except the small 3-4 lb containers don't work because the sides curve in and stones bind up. The 10 lb works fine. Perhaps they have redesigned the small ones, I don't know. Bob
  11. Very strange looking for sure, if the brown is calcite easy to tell. We have been talking zeolites, could the stained brown be stilbite or something similar?
  12. I agree with Clay's chabazite, looks right from the photo
  13. I think you have a good idea Bob. I use a 12# Thumler to start with 220 grit silicon. I then go to a Diamond Pacific sonic 10# tumbler for the 600 grit, pre polish aluminum , then tin oxide. The rotary jobs do use way more grit although you do not have to use the amount suggested.
  14. Other possibility could be hornblende
  15. A few Alaskan breccia including an agatized breccia
  16. Is it heavy? Does a detector sound off on it? Grind of an edge to see what it looks like
  17. The light colored one slight chance to be a geode, others no chance
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